AbstractTwo dietary fibres with distinct structural features (pea hull and apple fibre) were fermentedin vitrowith human faecal bacteria. The composition and physicochemical properties (cation exchange, hydration properties) of the residues were examined. Gas and short‐chain fatty acid (SFCA) productions attested of the highest fermentability of apple fibre. After 24 h, 75 of the pea fibre and 42 of the apple fibre could be recovered. Production of the major SCFA, acetate, propionate and butyrate occured in the molar ratio 68:17:9 for both fibres. Uronic acid and arabinose were the most extensively fermented sugars while xylose and glucose were the least fermented. Cation exchange capacity of the two fibres did not decrease much during fermentation, which implies that the amount of bound mineral is proportional to the amount of residual fibres. The values of the hydration properties of the residual fibres were at least equal to or higher than those of initial fibres. In spite of the degradation of the fibres during fermentation, a physical structure able to retain water remaine
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